You could also look at applying an image to an object (with alpha channel capability) like the ParaPicture object in the GDL Object Depository. With a little extra scripting, this could be set to rotate with the view. Or perhaps someone else can suggest a rotating billboard that is already done.
Richard -------------------------- Richard Morrison, Architect-Interior Designer AC26 (since AC6.0), Win10
and for a turning billboard:
The GDL Cookbook is downloadable somewhere. Don't have the URL handy, but you should be able to find it here with a search.
Richard -------------------------- Richard Morrison, Architect-Interior Designer AC26 (since AC6.0), Win10